UP6204 データシートの表示（PDF） - Unspecified

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UP6204

Compact Three-Phase Synchronous-Rectified Buck Controller

Unspecified 

Preliminary

uP6204

Functional Description

PCIE +12V

Phase 1/2

Converter

EXT +12V

Phase 3

Converter

VCC1

uP6204

VCC2

Operation

Phase

Selection

External Power Detection

Ext. Pwr Plugged = 0

Ext. Pwr Not Plugged = 1

MODE

Figure 2. Single/Three Phase Operation

Dynamic Voltage Management

The uP6204 provides a comprehensive dynamic voltage

management scheme as shown in Figure 3. VREF is the

reference voltage used for voltage control loop. VREF is

default connected VREF/P and can be programmed to either

VREFS or VREFP by PMBUS, see the related section for details.

The VREFS is a reference voltage programmed by PMBUS.

The VREFP is a reference voltage programmed by the VID0

and VID1 inputs. One of the voltage levels Level[1:4] is

selected as V as illustrated in table 2. Initially, Level[1:4]

REFP

are defined as V defined by R[1:4] pins. Level[1:4] can

R[1:4]

also be overwritten by PMBUS according the AMD GPU

VID Table as shown in Table 3.

R1/R2/R3/R4 define four voltage levels through voltage

dividers for power on default setting.

VR[1:4]

=

VCC5

×

RLOW

RHIGH + RLOW

where VCC5 is the 5.0V reference output voltage at 5VCC

pin. Note that the VR2 is the default reference voltage

level for soft start.

Table 2. Parallel VID Selection.

VID[1:0]

VREFP Voltage

Set by R1/R2/R3/4

Set by PM Bus

00

VR1

01

VR2

10

VR3

11

VR4

Level 1

Level 2

Level 3

Level 4

Voltage Control Loop and Power On Sequence

Figure 4 and Figure 5 show the voltage control loop and

typical power on sequence of uP6204 respectively. The

power on reset is acknowledged and the controller is

enabled at T0. A buffer with 160uA maximum current

capability starts to charge the soft start capacitor

AMD GPU Table

6-Bit/64-Level

Range: 0.8V ~ 1.2V

Step: ~12.5mV

5VCC

R1

R2

R3

R4

PMBUS Programmable

PWR

ON

Default

Setting

Level 1

Level 2

Level 3

Level 4

Power Play

Table

PMBUS Select

(SVID)

PMBUS enable SVID mode

(Default PVID mode)

VREF/S

VREF/P

2-Bit PVID

Select

VREF

Figure 4. Dynamic Voltage Management

uPI Semiconductor Corp., http://www.upi-semi.com

7

Rev. P01, File Name: uP6204-DS-P01000

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